使用JdbcTemplate的步骤
1、设置spring-jdbc和spring-tx的坐标(也就是导入依赖)
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< dependency > < groupId >org.springframework</ groupId > < artifactId >spring-jdbc</ artifactId > < version >5.2.7.RELEASE</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-tx</ artifactId > < version >5.2.7.RELEASE</ version > </ dependency > |
2、创建数据表和实体类
- 创建数据表的过程省略
- 创建实体类Account
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package com.jdbcTemplate.bean; public class Account { private String name; private Double money; public String getName() { return name; } public void setName(String name) { this .name = name; } public Double getMoney() { return money; } public void setMoney(Double money) { this .money = money; } @Override public String toString() { return "Account{" + "name='" + name + '\ '' + ", money=" + money + '}' ; } } |
3、创建数据源、JdbcTemplate对象
4、执行数据库操作
实现3、4步的方法提供以下三种
方法一:代码中直接配置数据源和数据对象
创建JdbcTemplate对象+执行jdbc语句
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//创建数据源对象 DriverManagerDataSource ds = new DriverManagerDataSource(); ds.setDriverClassName( "com.mysql.jdbc.Driver" ); ds.setUrl( "jdbc:mysql://localhost:3306/think" ); ds.setUsername( "root" ); ds.setPassword( "" ); //创建jdbcTemplate对象 JdbcTemplate jt = new JdbcTemplate(); //执行操作(插入操作) jt.setDataSource(ds); jt.execute( "insert into account(name,money)value('EVA',50000)" ); |
方法二:在resources目录下配置xx.xml文件,对数据源、JdbcTemplate进行注入
配置xml文件
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:p = "http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- //配置数据源--> < bean id = "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" > < property name = "driverClassName" value = "com.mysql.jdbc.Driver" /> < property name = "url" value = "jdbc:mysql://localhost:3306/think" /> < property name = "username" value = "root" /> < property name = "password" value = "" /> </ bean > <!-- //配置jdbcTemplate--> < bean id = "jdbcTemplate" class = "org.springframework.jdbc.core.JdbcTemplate" > < property name = "dataSource" ref = "dataSource" /> </ bean > |
使用配置操作数据库
编写test类测试
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//二、使用配置操作数据库 //1、获取容器 ApplicationContext ac = new ClassPathXmlApplicationContext( "beans5.xml" ); //2、获取对象 JdbcTemplate jt = ac.getBean( "jdbcTemplate" ,JdbcTemplate. class ); //、执行操作 // jt.execute("insert into account(name,money)value ('Alice',2000)"); //保存 //jt.update("insert into account(name,money)value (?,?)","Eden",100); //更新 // jt.update("update account set money=?,name=? where name=?",1000,"Kiroto","Eden"); //删除 //jt.update("delete from account where name =? and money =?","Kiroto",1000); //查找 List<Account> list = jt.query( "select * from account where name =?" , new BeanPropertyRowMapper<Account>(Account. class ), "Eden" ); System.out.println(list.isEmpty()? "没有查找结果" :list.get( 0 )); |
方法三:使用接口实现
创建template接口和templateDAO接口实现类
接口
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package com.jdbcTemplate.test; import com.jdbcTemplate.bean.Account; public interface Template { Account find(String name); int update(Account account); int delete(Account account); int add(Account account); } |
接口实现类
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package com.jdbcTemplate.test; import com.jdbcTemplate.bean.Account; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import java.util.List; public class TemplateDAO implements Template { private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this .jdbcTemplate = jdbcTemplate; } public Account find(String name) { //查找 List<Account> list = jdbcTemplate.query( "select * from account where name=?" , new BeanPropertyRowMapper<Account>(Account. class ),name); return list.isEmpty()? null :list.get( 0 ); } public int update(Account account) { //更新 return jdbcTemplate.update( "update account set money=? where name=?" , account.getMoney(),account.getName()); } public int delete(Account account) { //删除 return jdbcTemplate.update( "delete from account where name =?" ,account.getName()); } public int add(Account account) { //添加 return jdbcTemplate.update( "insert into account(name ,money)value (?,?)" ,account.getName(),account.getMoney()); } } |
在测试之前,因为多了一个接口实现类,除了数据源和jdbcTemplate之外,应当在xml配置文件中多配置一个TemplateDAO
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<!-- 配置账户的持久层--> < bean id = "templateDAO" class = "com.jdbcTemplate.test.TemplateDAO" > < property name = "jdbcTemplate" ref = "jdbcTemplate" /> </ bean > |
编写测试类进行测试
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import com.jdbcTemplate.bean.Account; import com.jdbcTemplate.test.Template; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class mytest { public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext( "beans6.xml" ); Template tp = ac.getBean( "templateDAO" ,Template. class ); //注意对比方法二的不同 Account account = tp.find( "Lily" ); System.out.println(account.toString()); } } |
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原文链接:https://blog.csdn.net/L_GRAND_ORDER/article/details/107449883